Preparation of polypropylene/poly(styrene-co-(butyl methacrylate)) nanoblends by diffusion and subsequent copolymerization of monomers in isotactic polypropylene pellets
Preparation of polypropylene/poly(styrene-co-(butyl methacrylate)) nanoblends by diffusion and subsequent copolymerization of monomers in isotactic polypropylene pellets
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DOI：
10.1007/s10118-015-1686-z
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发表时间：
2015-08
影响因子：
4.3
通讯作者：
Haizhen Qiu;Fang Chen;Zhao‐Xia Guo;Jian Yu
中科院分区：
文献类型：
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作者：
Haizhen Qiu;Fang Chen;Zhao‐Xia Guo;Jian Yu
研究了苯乙烯(St)/甲基丙烯酸丁酯(BMA)混合单体在PP微球中的扩散和后续共聚反应，制备了共聚纳米共混物。在90℃水中扩散反应2 h，在少量St的辅助下加入BPO引发共聚反应。用显微FTIR研究了St和BMA单元的径向分布以及St/BMA的比值。ST和BMA均可弥散进入PP小球中心。在所有共聚物共混物中，St/BMA比值的径向分布是恒定的。共聚物的组成取决于共聚单体的投料比。用四氢呋喃萃取后，用凝胶渗透色谱(GPC)测定了共聚物的相对分子质量。用场发射扫描电子显微镜对共混物的相形态进行了研究，结果表明共混物的平均粒径小于100 nm。DSC测量表明，St/BMA单体的扩散和随后的共聚只发生在PP微球的无定形区域。
The diffusion and subsequent copolymerization of styrene (St)/butyl methacrylate (BMA) mixed monomers iniPP pellets to prepare copolymer nanoblends were investigated. The diffusion step was carried out at 90 °C for 2 h in water, and the copolymerization was initiated by the addition of BPO with the aid of a small amount of St. The diametrical distributions of both St and BMA units and their ratio St/BMA were investigated by micro FTIR. Both St and BMA can diffuse into the centres ofiPP pellets. The diametrical distribution of St/BMA ratio is constant in all the copolymer blends. The copolymer composition depends on the comonomer feed ratio. The molecular weights of the copolymers were measured by GPC after extraction with tetrahydrofuran. The phase morphology of the copolymer blends was investigated by FESEM, showing the average particle sizes of less than 100 nm. DSC measurements show that the diffusion and subsequent copolymerization of St/BMA monomers only occur in the amorphous regions ofiPP pellets.